Every forecast across The Miami Valley, highway-clear.
Official National Weather Service forecasts for the Miami Valley — eleven counties on the Great and Little Miami, from Dayton and Kettering out to Springfield and Xenia, north through Troy and Piqua to Sidney, and west to Greenville and Celina.
Every Ohio region shares one system — the same maps, the same live radar, the same climate record. The Miami Valley is Ohio's tornado corridor. The Memorial Day 2019 outbreak put fifteen tornadoes down across these counties in a night, and the 1974 Xenia tornado is still one of the worst in American history. The rivers that made the region flood it too — the 1913 flood is why Dayton built the dams it did.